Improvement in punching leather



UNITED STATES PATENT OEEToE.

JAMES M. BENT, OFHNVAYLAND, MASSACHUSETTS.

IMPROVEMENT IN PUVNCHING LEATHER.

Specificationforming part of Letters Patent No. 58,762, dated October 16, 1866.

To all whom it may concern:

Be it known that I, J AMES M. BENT, of Wayland, in the county of Middlesex and State of Massachusetts, have invented certain Improvements in Machines for Punching Leather, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this speciication, in which- Figure 1 is a plan of my improved machine. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical section on the line a' x of Fig. l.

My invention consists in arevolving punch, used in connection with dies of various diameters, the punch and its dies, when being brought down, simultaneously making the hole and producing around it the imitation of an eyelet.

My invention also consists in the use of a pin which clears the punch when made hollow; and my invention furthermore consists in an improved arrangement by which the die is made to adapt itself to leather of varying thickness and insure at all timesthe degree of pressure required thereon.

To enable others skilled in the art to understand and use my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A is a bed or table, supported by legs a. To the upper side of t-he table is secured one end of a bent standard, B, the other end of which is provided with bearings, in which a vertical spindle, C, carryinga hollow punch, D, and die E, is made to revolve in the following manner:

F is the drivin g-shaft, to one end of which is secured the drivin g-pulley G. The other end of the shaft F carries a bevel-wheel, H, which engages with a bevel-pinion, I, at the foot ot' a vertical shaft, J, provided with a cog-wheel, K, which drives the cog-wheel L on thc upper end of a vertical shaft, M. N is a circular drum, keyed to the shaft M, and carries an endless belt, O, which passes around an enlarged portion of the vertical spindle C, which is thereby caused to revolve.

The manner in which the punch with its die is raised and lowered will now be described.

Near the upper end of the shaft J is formed a spool, l?, around which and a drum, Q, upon an upright shaft, R, passes an endless belt, S.

The upper portion of the drum Q is provided with a cam-groove, b, for the reception of a roller, y, on a pin, c, which projects from the head of the spindle-stock T, whiehis raised or lowered within guides U when the drum Q is revolved upon its shaft R, which is provided with a screw-thread, d, upon which turns a nut, e, and by which the shaft may be raised or lowered to adjust the drum Q to the right height for bringing' the die down sufficiently upon the leather to produce the desired imita tion of an eyelet. In the top of the drum Q is formed a circular cavity, 5, for the reception of a spiral spring, 6, the lower end of which rests on the floor of the cavity, while the other end of the spring bears on the under side of a circular plate, 7, which is raised or lowered, so as to release or compress the spring 6, by operatin g a nut, S, which turns on a screw-thread cut on the upper end of the shaft It, in order that, when leather of varying thickness is passed through the machine, the drum will at all times exert the required degree of pressure to cause the die E to be borne down sufliciently upon the lea-ther to produce the form of an eyelet, which shall remain permanently thereon. By thus revolving the die rapidly instead of merely stamping it upon the leather, the surface is worn away or compressed so as to leave a smooth and finished impression.

The revolving punch D is of the form seen in section, Fig. 3, and fits into the lower end ot' the spindle (l, which is provided with an opening, f, through which the portion of the leather cut out is delivered when brought down against a pin, g, which is moved up or down, and confined when adjusted vertically by a set-screw, h, within a sliding piece, V, the office of which is to bring the pin g inixthe center of the hole j, through which the punch descends.

The rapid revolution of the punch causesit to penetrate the leather without the employment of a solid bearing. The die E is of such a form as to make an impression in exact imitation of an eyelet, and the die is firmly se cured to near the lower end of the punch D by a set-screw, t', by which means a die may be removed, and one of a different size substituted therefor, in a ready and convenient manner.

XV is a gage or guide, against which the edge of the leather is placed to determine the distance of the line ofthe centers of the holes to be punched. One edge of this gage is straight, while its opposite edge is curved, in order to accommodate the various patterns of work to be made.

The edge of the punch is made sharper than where it is to be used in connection with a solid bed or bearing, and there is therefore less liabilityof the punch becoming so quickly dulled. v

When it is desired tov make a hole or incitation of an eyelet of a different diameter than those previously made, it is only necessary to remove the punch from the lower end of the spindle C, when, after detaching the die7 a ditferent one may be secured to the proper-sized punch, which may then be instantly fitted in place within its spindle.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The revolving punch D, with its die E, substantially as and for the purpose set forth.

2. In combination with the above7 the pin g, for clearing the punch D, substantially as described.

3. The spring 6, or its equivalent, for the purpose of causing the dieE to adapt itself to leather of varying thickness7 substantially as set forth.

JAMns M. BENT.

lVitucsses l. E. TESOHEMACHER, N. W. SrnARNs. 

